QwtPainter Class Reference

A collection of QPainter workarounds. More...

#include <qwt_painter.h>

List of all members.

Static Public Member Functions
static QPixmap	backingStore (QWidget *, const QSize &)
static qreal	devicePixelRatio (const QPaintDevice *)
static void	drawBackgound (QPainter *painter, const QRectF &rect, const QWidget *widget)
static void	drawColorBar (QPainter *painter, const QwtColorMap &, const QwtInterval &, const QwtScaleMap &, Qt::Orientation, const QRectF &)
static void	drawEllipse (QPainter *, const QRectF &)
	Wrapper for QPainter::drawEllipse()
static void	drawFocusRect (QPainter *, const QWidget *)
	Draw a focus rectangle on a widget using its style.
static void	drawFocusRect (QPainter *, const QWidget *, const QRect &)
	Draw a focus rectangle on a widget using its style.
static void	drawFrame (QPainter *, const QRectF &rect, const QPalette &palette, QPalette::ColorRole foregroundRole, int lineWidth, int midLineWidth, int frameStyle)
static void	drawImage (QPainter *, const QRectF &, const QImage &)
	Wrapper for QPainter::drawImage()
static void	drawLine (QPainter *, double x1, double y1, double x2, double y2)
	Wrapper for QPainter::drawLine()
static void	drawLine (QPainter *, const QPointF &p1, const QPointF &p2)
	Wrapper for QPainter::drawLine()
static void	drawLine (QPainter *, const QLineF &)
	Wrapper for QPainter::drawLine()
static void	drawPath (QPainter *, const QPainterPath &)
	Wrapper for QPainter::drawPath()
static void	drawPie (QPainter *, const QRectF &r, int a, int alen)
	Wrapper for QPainter::drawPie()
static void	drawPixmap (QPainter *, const QRectF &, const QPixmap &)
	Wrapper for QPainter::drawPixmap()
static void	drawPoint (QPainter *, const QPoint &)
	Wrapper for QPainter::drawPoint()
static void	drawPoint (QPainter *, double x, double y)
	Wrapper for QPainter::drawPoint()
static void	drawPoint (QPainter *, const QPointF &)
	Wrapper for QPainter::drawPoint()
static void	drawPoints (QPainter *, const QPolygon &)
	Wrapper for QPainter::drawPoints()
static void	drawPoints (QPainter *, const QPoint *, int pointCount)
	Wrapper for QPainter::drawPoints()
static void	drawPoints (QPainter *, const QPolygonF &)
	Wrapper for QPainter::drawPoints()
static void	drawPoints (QPainter *, const QPointF *, int pointCount)
	Wrapper for QPainter::drawPoints()
static void	drawPolygon (QPainter *, const QPolygonF &)
	Wrapper for QPainter::drawPolygon()
static void	drawPolygon (QPainter *, const QPolygon &)
	Wrapper for QPainter::drawPolygon()
static void	drawPolyline (QPainter *, const QPolygonF &)
	Wrapper for QPainter::drawPolyline()
static void	drawPolyline (QPainter *, const QPointF *, int pointCount)
	Wrapper for QPainter::drawPolyline()
static void	drawPolyline (QPainter *, const QPolygon &)
	Wrapper for QPainter::drawPolyline()
static void	drawPolyline (QPainter *, const QPoint *, int pointCount)
	Wrapper for QPainter::drawPolyline()
static void	drawRect (QPainter *, double x, double y, double w, double h)
	Wrapper for QPainter::drawRect()
static void	drawRect (QPainter *, const QRectF &rect)
	Wrapper for QPainter::drawRect()
static void	drawRoundedFrame (QPainter *, const QRectF &, double xRadius, double yRadius, const QPalette &, int lineWidth, int frameStyle)
static void	drawRoundFrame (QPainter *, const QRectF &, const QPalette &, int lineWidth, int frameStyle)
static void	drawSimpleRichText (QPainter *, const QRectF &, int flags, const QTextDocument &)
static void	drawText (QPainter *, double x, double y, const QString &)
	Wrapper for QPainter::drawText()
static void	drawText (QPainter *, const QPointF &, const QString &)
	Wrapper for QPainter::drawText()
static void	drawText (QPainter *, double x, double y, double w, double h, int flags, const QString &)
	Wrapper for QPainter::drawText()
static void	drawText (QPainter *, const QRectF &, int flags, const QString &)
	Wrapper for QPainter::drawText()
static void	fillPixmap (const QWidget *, QPixmap &, const QPoint &offset=QPoint())
static void	fillRect (QPainter *, const QRectF &, const QBrush &)
	Wrapper for QPainter::fillRect()
static bool	isAligning (QPainter *painter)
static bool	isX11GraphicsSystem ()
static bool	polylineSplitting ()
static bool	roundingAlignment ()
static bool	roundingAlignment (QPainter *)
static void	setPolylineSplitting (bool)
	En/Disable line splitting for the raster paint engine.
static void	setRoundingAlignment (bool)
Static Private Attributes
static bool	d_polylineSplitting = true
static bool	d_roundingAlignment = true

---

Detailed Description

A collection of QPainter workarounds.

Definition at line 39 of file qwt_painter.h.

---

Member Function Documentation

QPixmap QwtPainter::backingStore	(	QWidget *	widget,
		const QSize &	size
	)		[static]

Returns:

A pixmap that can be used as backing store

Parameters:

widget	Widget, for which the backingstore is intended
size	Size of the pixmap

Definition at line 1387 of file qwt_painter.cpp.

qreal QwtPainter::devicePixelRatio

(

const QPaintDevice *

paintDevice

)

[static]

Returns:

Pixel ratio for a paint device

Parameters:

paintDevice

Paint device

Definition at line 1353 of file qwt_painter.cpp.

void QwtPainter::drawBackgound	(	QPainter *	painter,
		const QRectF &	rect,
		const QWidget *	widget
	)		[static]

Fill rect with the background of a widget

Parameters:

painter	Painter
rect	Rectangle to be filled
widget	Widget

See also:

QStyle::PE_Widget, QWidget::backgroundRole()

Definition at line 1328 of file qwt_painter.cpp.

void QwtPainter::drawColorBar	(	QPainter *	painter,
		const QwtColorMap &	colorMap,
		const QwtInterval &	interval,
		const QwtScaleMap &	scaleMap,
		Qt::Orientation	orientation,
		const QRectF &	rect
	)		[static]

Draw a color bar into a rectangle

Parameters:

painter	Painter
colorMap	Color map
interval	Value range
scaleMap	Scale map
orientation	Orientation
rect	Traget rectangle

Definition at line 1182 of file qwt_painter.cpp.

void QwtPainter::drawEllipse	(	QPainter *	painter,
		const QRectF &	rect
	)		[static]

Wrapper for QPainter::drawEllipse()

Definition at line 410 of file qwt_painter.cpp.

void QwtPainter::drawFocusRect	(	QPainter *	painter,
		const QWidget *	widget
	)		[static]

Draw a focus rectangle on a widget using its style.

Definition at line 777 of file qwt_painter.cpp.

void QwtPainter::drawFocusRect	(	QPainter *	painter,
		const QWidget *	widget,
		const QRect &	rect
	)		[static]

Draw a focus rectangle on a widget using its style.

Definition at line 783 of file qwt_painter.cpp.

void QwtPainter::drawFrame	(	QPainter *	painter,
		const QRectF &	rect,
		const QPalette &	palette,
		QPalette::ColorRole	foregroundRole,
		int	frameWidth,
		int	midLineWidth,
		int	frameStyle
	)		[static]

Draw a rectangular frame

Parameters:

painter	Painter
rect	Frame rectangle
palette	Palette
foregroundRole	Foreground role used for QFrame::Plain
frameWidth	Frame width
midLineWidth	Used for QFrame::Box
frameStyle	bitwise OR´ed value of QFrame::Shape and QFrame::Shadow

Definition at line 873 of file qwt_painter.cpp.

void QwtPainter::drawImage	(	QPainter *	painter,
		const QRectF &	rect,
		const QImage &	image
	)		[static]

Wrapper for QPainter::drawImage()

Definition at line 735 of file qwt_painter.cpp.

void QwtPainter::drawLine	(	QPainter *	painter,
		double	x1,
		double	y1,
		double	x2,
		double	y2
	)		[inline, static]

Wrapper for QPainter::drawLine()

Definition at line 147 of file qwt_painter.h.

void QwtPainter::drawLine	(	QPainter *	painter,
		const QPointF &	p1,
		const QPointF &	p2
	)		[static]

Wrapper for QPainter::drawLine()

Definition at line 525 of file qwt_painter.cpp.

void QwtPainter::drawLine	(	QPainter *	painter,
		const QLineF &	line
	)		[inline, static]

Wrapper for QPainter::drawLine()

Definition at line 154 of file qwt_painter.h.

void QwtPainter::drawPath	(	QPainter *	painter,
		const QPainterPath &	path
	)		[static]

Wrapper for QPainter::drawPath()

Definition at line 325 of file qwt_painter.cpp.

void QwtPainter::drawPie	(	QPainter *	painter,
		const QRectF &	r,
		int	a,
		int	alen
	)		[static]

Wrapper for QPainter::drawPie()

Definition at line 398 of file qwt_painter.cpp.

void QwtPainter::drawPixmap	(	QPainter *	painter,
		const QRectF &	rect,
		const QPixmap &	pixmap
	)		[static]

Wrapper for QPainter::drawPixmap()

Definition at line 756 of file qwt_painter.cpp.

void QwtPainter::drawPoint	(	QPainter *	painter,
		const QPoint &	pos
	)		[static]

Wrapper for QPainter::drawPoint()

Definition at line 653 of file qwt_painter.cpp.

void QwtPainter::drawPoint	(	QPainter *	painter,
		double	x,
		double	y
	)		[inline, static]

Wrapper for QPainter::drawPoint()

Definition at line 129 of file qwt_painter.h.

void QwtPainter::drawPoint	(	QPainter *	painter,
		const QPointF &	pos
	)		[static]

Wrapper for QPainter::drawPoint()

Definition at line 641 of file qwt_painter.cpp.

void QwtPainter::drawPoints	(	QPainter *	painter,
		const QPolygon &	polygon
	)		[inline, static]

Wrapper for QPainter::drawPoints()

Definition at line 135 of file qwt_painter.h.

void QwtPainter::drawPoints	(	QPainter *	painter,
		const QPoint *	points,
		int	pointCount
	)		[static]

Wrapper for QPainter::drawPoints()

Definition at line 676 of file qwt_painter.cpp.

void QwtPainter::drawPoints	(	QPainter *	painter,
		const QPolygonF &	polygon
	)		[inline, static]

Wrapper for QPainter::drawPoints()

Definition at line 141 of file qwt_painter.h.

void QwtPainter::drawPoints	(	QPainter *	painter,
		const QPointF *	points,
		int	pointCount
	)		[static]

Wrapper for QPainter::drawPoints()

Definition at line 709 of file qwt_painter.cpp.

void QwtPainter::drawPolygon	(	QPainter *	painter,
		const QPolygonF &	polygon
	)		[static]

Wrapper for QPainter::drawPolygon()

Definition at line 545 of file qwt_painter.cpp.

void QwtPainter::drawPolygon	(	QPainter *	painter,
		const QPolygon &	polygon
	)		[static]

Wrapper for QPainter::drawPolygon()

Definition at line 594 of file qwt_painter.cpp.

void QwtPainter::drawPolyline	(	QPainter *	painter,
		const QPolygonF &	polygon
	)		[static]

Wrapper for QPainter::drawPolyline()

Definition at line 558 of file qwt_painter.cpp.

void QwtPainter::drawPolyline	(	QPainter *	painter,
		const QPointF *	points,
		int	pointCount
	)		[static]

Wrapper for QPainter::drawPolyline()

Definition at line 572 of file qwt_painter.cpp.

void QwtPainter::drawPolyline	(	QPainter *	painter,
		const QPolygon &	polygon
	)		[static]

Wrapper for QPainter::drawPolyline()

Definition at line 607 of file qwt_painter.cpp.

void QwtPainter::drawPolyline	(	QPainter *	painter,
		const QPoint *	points,
		int	pointCount
	)		[static]

Wrapper for QPainter::drawPolyline()

Definition at line 621 of file qwt_painter.cpp.

void QwtPainter::drawRect	(	QPainter *	painter,
		double	x,
		double	y,
		double	w,
		double	h
	)		[static]

Wrapper for QPainter::drawRect()

Definition at line 331 of file qwt_painter.cpp.

void QwtPainter::drawRect	(	QPainter *	painter,
		const QRectF &	rect
	)		[static]

Wrapper for QPainter::drawRect()

Definition at line 337 of file qwt_painter.cpp.

void QwtPainter::drawRoundedFrame	(	QPainter *	painter,
		const QRectF &	rect,
		double	xRadius,
		double	yRadius,
		const QPalette &	palette,
		int	lineWidth,
		int	frameStyle
	)		[static]

Draw a rectangular frame with rounded borders

Parameters:

painter	Painter
rect	Frame rectangle
xRadius	x-radius of the ellipses defining the corners
yRadius	y-radius of the ellipses defining the corners
palette	QPalette::WindowText is used for plain borders QPalette::Dark and QPalette::Light for raised or sunken borders
lineWidth	Line width
frameStyle	bitwise OR´ed value of QFrame::Shape and QFrame::Shadow

Definition at line 1042 of file qwt_painter.cpp.

void QwtPainter::drawRoundFrame	(	QPainter *	painter,
		const QRectF &	rect,
		const QPalette &	palette,
		int	lineWidth,
		int	frameStyle
	)		[static]

Draw a round frame

Parameters:

painter	Painter
rect	Frame rectangle
palette	QPalette::WindowText is used for plain borders QPalette::Dark and QPalette::Light for raised or sunken borders
lineWidth	Line width
frameStyle	bitwise OR´ed value of QFrame::Shape and QFrame::Shadow

Definition at line 807 of file qwt_painter.cpp.

void QwtPainter::drawSimpleRichText	(	QPainter *	painter,
		const QRectF &	rect,
		int	flags,
		const QTextDocument &	text
	)		[static]

Draw a text document into a rectangle

Parameters:

painter	Painter
rect	Traget rectangle
flags	Alignments/Text flags, see QPainter::drawText()
text	Text document

Definition at line 473 of file qwt_painter.cpp.

void QwtPainter::drawText	(	QPainter *	painter,
		double	x,
		double	y,
		const QString &	text
	)		[static]

Wrapper for QPainter::drawText()

Definition at line 422 of file qwt_painter.cpp.

void QwtPainter::drawText	(	QPainter *	painter,
		const QPointF &	pos,
		const QString &	text
	)		[static]

Wrapper for QPainter::drawText()

Definition at line 429 of file qwt_painter.cpp.

void QwtPainter::drawText	(	QPainter *	painter,
		double	x,
		double	y,
		double	w,
		double	h,
		int	flags,
		const QString &	text
	)		[static]

Wrapper for QPainter::drawText()

Definition at line 446 of file qwt_painter.cpp.

void QwtPainter::drawText	(	QPainter *	painter,
		const QRectF &	rect,
		int	flags,
		const QString &	text
	)		[static]

Wrapper for QPainter::drawText()

Definition at line 454 of file qwt_painter.cpp.

void QwtPainter::fillPixmap	(	const QWidget *	widget,
		QPixmap &	pixmap,
		const QPoint &	offset = QPoint()
	)		[static]

Fill a pixmap with the content of a widget

In Qt >= 5.0 QPixmap::fill() is a nop, in Qt 4.x it is buggy for backgrounds with gradients. Thus fillPixmap() offers an alternative implementation.

Parameters:

widget	Widget
pixmap	Pixmap to be filled
offset	Offset

See also:

QPixmap::fill()

Definition at line 1288 of file qwt_painter.cpp.

void QwtPainter::fillRect	(	QPainter *	painter,
		const QRectF &	rect,
		const QBrush &	brush
	)		[static]

Wrapper for QPainter::fillRect()

Definition at line 366 of file qwt_painter.cpp.

bool QwtPainter::isAligning

(

QPainter *

painter

)

[static]

Check if the painter is using a paint engine, that aligns coordinates to integers. Today these are all paint engines beside QPaintEngine::Pdf and QPaintEngine::SVG.

If we have an integer based paint engine it is also checked if the painter has a transformation matrix, that rotates or scales.

Parameters:

painter

Painter

Returns:

true, when the painter is aligning

See also:

setRoundingAlignment()

Definition at line 264 of file qwt_painter.cpp.

bool QwtPainter::isX11GraphicsSystem

(

)

[static]

Check is the application is running with the X11 graphics system that has some special capabilities that can be used for incremental painting to a widget.

Returns:

True, when the graphics system is X11

Definition at line 230 of file qwt_painter.cpp.

bool QwtPainter::polylineSplitting

(

)

[inline, static]

Returns:

True, when line splitting for the raster paint engine is enabled.

See also:

setPolylineSplitting()

Definition at line 163 of file qwt_painter.h.

bool QwtPainter::roundingAlignment

(

)

[inline, static]

Check whether coordinates should be rounded, before they are painted to a paint engine that rounds to integer values. For other paint engines ( PDF, SVG ), this flag has no effect.

Returns:

True, when rounding is enabled

See also:

setRoundingAlignment(), isAligning()

Definition at line 176 of file qwt_painter.h.

bool QwtPainter::roundingAlignment

(

QPainter *

painter

)

[inline, static]

Returns:

roundingAlignment() && isAligning(painter);

Parameters:

painter

Painter

Definition at line 185 of file qwt_painter.h.

void QwtPainter::setPolylineSplitting

(

bool

enable

)

[static]

En/Disable line splitting for the raster paint engine.

In some Qt versions the raster paint engine paints polylines of many points much faster when they are split in smaller chunks: f.e all supported Qt versions >= Qt 5.0 when drawing an antialiased polyline with a pen width >=2.

Also the raster paint engine has a nasty bug in many versions ( Qt 4.8 - ... ) for short lines ( https://codereview.qt-project.org/#/c/99456 ), that is worked around in this mode.

The default setting is true.

See also:

polylineSplitting()

Definition at line 319 of file qwt_painter.cpp.

void QwtPainter::setRoundingAlignment

(

bool

enable

)

[static]

Enable whether coordinates should be rounded, before they are painted to a paint engine that floors to integer values. For other paint engines ( PDF, SVG ) this flag has no effect. QwtPainter stores this flag only, the rounding itself is done in the painting code ( f.e the plot items ).

The default setting is true.

See also:

roundingAlignment(), isAligning()

Definition at line 299 of file qwt_painter.cpp.

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Member Data Documentation

bool QwtPainter::d_polylineSplitting = true [static, private]

Definition at line 124 of file qwt_painter.h.

bool QwtPainter::d_roundingAlignment = true [static, private]

Definition at line 125 of file qwt_painter.h.

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The documentation for this class was generated from the following files:

• qwt_painter.h
• qwt_painter.cpp